Heteropoly Compounds as Ammoxidation Catalysts

  • K. Narasimha Rao
  • Ch. Srilakshmi
  • K. Mohan Reddy
  • B. Hari Babu
  • N. Lingaiah
  • P. S. Sai Prasad


This chapter gives an overview of the work carried out in our group on the application of various forms of heteropoly acids (HPAs) for ammoxidation of methylpyrazine (MP). It starts with a general description of HPAs, ammonium salts of HPA, and the metal substituted HPAs (combinedly called as heteropoly compounds, HPCs). The various methods adopted for the synthesis of these compounds have been described. The HPCs have also been dispersed on different supports, and the methodology of their preparation is presented. Different characterization techniques have been used to determine their physicochemical properties. The reactivity of the catalysts is evaluated for the ammoxidation of 2-methylpyrazine (MP) to 2-cyanopyrazine (CP). The enhanced thermal stability and activity of the supported systems compared with those of the bulk ones are highlighted. Two new methods – one for the preparation of catalysts by in situ synthesis of the ammonium salt of heteropoly acid on supports and the other for the determination of dispersion of HPC on the support by FTIR technique – developed in our laboratory are introduced. Finally, correlations drawn between the activity and selectivity with the physicochemical properties of HPCs are presented.


Ammonium Salt Heteropoly Acid Keggin Structure Heteropoly Compound Keggin Unit 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



Thanks are due to Director, CSIR-Indian Institute of Chemical Technology, Hyderabad, for permitting to carry out the work. The authors are thankful to Dr. I Suryanarayana for his help in the interpretation of NMR results.


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Copyright information

© Panch Tattva Publishers, Pune, India 2013

Authors and Affiliations

  • K. Narasimha Rao
    • 1
  • Ch. Srilakshmi
    • 2
  • K. Mohan Reddy
    • 3
  • B. Hari Babu
    • 4
  • N. Lingaiah
    • 4
  • P. S. Sai Prasad
    • 4
  1. 1.Chemistry Department, Faculty of ScienceKing Abdulaziz UniversityJeddahSaudi Arabia
  2. 2.Solid State and Structural Chemistry UnitIndian Institute of ScienceBangaloreIndia
  3. 3.Senior Research Associate, Center for Applied CatalysisSeton Hall UniversitySouth OrangeUSA
  4. 4.I & PC DivisionIndian Institute of Chemical TechnologyHyderabadIndia

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